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How we can set the CT ratios using the button in the front of the ME4zrt device.

The CT ratios are settable using the button in the front of the ME4zrt device. You can choose in between
the following for the primary (the secondary is always set to 5) : 40, 50, 60, 75, 80, 100, 125, 150, 200, 250,
300, 400, 500, 600, 800, 1000, 1200, 1250, 1500, 2000, 2500, 3000, 4000, 5000, 6000

To check or change the CT settings you must hold down the button for more than 5 sec. Then it should go
into a blinking state. Choose your CT setting then hold down the button to confirm it.